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\subsubsection{Data Collection}  Video data collection is performed using a specialy specially  constructed mast built for temporary high-angle video data collection and has tamper-proof, weather-proof, self-contained features presented in \cite{Jackson_2013}. \subsubsection{Camera types} 
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\subsubsection{Software}  \label{software}  The software used is the open-source Traffic Intelligence project \cite{Saunier_2010}, itself based on the computer vision platform openCV \cite{Brahmbhatt_2013}. This software provides the basic feature-tracking, trajectory management and coordinate projection \cite{Ismail_2013} functionality as well a few usage-specific tools such as correction for lens distortion (depicted in Figure~\ref{fig:cg-undistort}), trajectory clustering, and basic motion prediction functions. Some of the more advanced analysis tools and techniques presented in this paper are under development and will be made available as their functionality is completed and validated.